Honing device



Feb. 279 .1951 G, F WAGSTAFF 2,543,515

HONING DEVICE Filed Sept. 5, 1947 Haw- /s /7 20 25 24 2554 .95C

Patented Feb.. 27, 1951 HONING DEVICE George Frederick Wa land, assignor to Delapena & YSon Limited,

tenham, England gstaff, Cheltenham,

Eng- Chel- Application'September 5, 1947, Serial No. 772,451 In Great Britain September 13, 1946 3 Claims.

This invention relates to honing devices utilising honing mandrels of the type vhaving an abrasive element (which may be of natural abrasive stone or of Ycompositions impregnated with abrasive material and compressed to form the element) carried by the mandrel body, an elongated blade-like .wedge member slidably mounted in the said body for the radial adjustment of the abrasive element yand a springloaded member which extends axially .along the mandrel body to apply end pressure to the abrasive element and retainit in position in the mandrel body.

Honing mandi-els of the foregoing type are normally operated by means of a self-contained honing machine which provides 'a bearing for an adaptor by means of which the honing mandrel is carried and mounted in the machine, the latter containing mechanism for adjusting the blade-like wedge member to effect adjustment and feed of the abrasive element of the mandrel and also carrying an electric motor by which the adaptor and mandrel are driven at selected speeds. While honing machines of this character are eiiicient and reliable in operation, they are costly and may even be considered uneconomical equipment in the case of small Workshops where the machine would be only in occasional use.

The main object of the present invention .is to provide an adaptor for honing mandrels of the aforesaid type which will itself enable adjustment and feed of the abrasive element of the mandrel to be effected Without the provision of any extraneous control mechanism such as .has hitherto been provided by the honing machine.

Aceording to the invention the adaptor comprises a body, centrally bored to receive a honing mandrel of the aforesaid type and formed with an anchorage for the free end of said spring-loaded member, and a nut, rotatable in said adaptor body but prevented from axial movement therein, to elect axialmovement of the blade-like wedge member and resulting radiall movement of the abrasive element in thc imandrel body.

Thus, by means of the invention itis possible to hold the adaptor, with the honing mandrel mounted therein, in the hand with the work mounted in a lathe or other rotary spindle. vAlternatively, of. course, the adaptor and honing mandrel may loe-mounted for rotation, the work being held stationary or relatively rotated, In either case the necessity for a honing machine is obviated,Y and the invention, therefore, enables the mirror nishing of internal cylindrical sur- -bore I1 of the adaptor body and is scalloped (Cl.r 51-1843) faces free from any trace of ovality at a fraction ofthe cost of the honingmachines used by large workshops, factories or elsewhere where such machines are in regular use.

.One embodiment of the invention` will now Vbe described, by'way of example, with reference to the accompanying drawings, in which:

Figure 1 illustrates in axial section a preferred construction of the adaptor with a honing mandrel .in position,

Figure 2 is a plan view of the adaptor shown in Figure l with `.only the Wedge member and spring-loaded member illustrated, the mandrel body being omitted.

Figure 3 is a fragmentary View in axial jseQ- tion of a modied arrangement, and

Figure 4 is a section substantially on the line -i of Figure .1.

The device illustrated comprises an adaptor having a body le centrally bored at il to receive one end of a mandrel l2 which carries the abrasive element or stone i3 at or near its other end. The mandrel is provided with alongitudinal recess I i a portion of which receives the abrasive elemen i3 in its holder l5 while a blade-like wedge member i6 for the adjustment of the effective `diameter of cut lof Vthe abrasive element lies in the recess and is arranged for longitudinal movement therein to effect such adjustment. For this purpose vthe Wedgemember is provided with inclined orwedge portions I'Gb, 46c cro-operating with similarly inclined portions of a recessed surface lb of the holder l5. At the end from which the mandrel projects the adaptor body lli is counterboredat l'ly to receive a nut i8 which is free to rotate in the counterbore but is prevented from axial movement therein by means of a screw 4i9 the lpoint of which projects into an annular recess 2s in the nut.

A projecting portion yld of the wedge memjber is formed with serrations 2| meshing With the thread 22 of the nut i8. The mandrel l2 extends through the nut I8 and is retained against axial displacement from the bore il of the adaptor body as for example by means 'of a Agrub screw 23v and against rotation therein by means of a threaded pin 24 the point of which projects from the adaptor body into a slot 25 in the mandrel. Thus, by rotation'of the nut i3 relatively to the adaptor body i!) thev Wedge member I6 may be traversedback and forth to effect stone adjustment radially of the mandrel.

One end of the nut projects from the counter- I8a to facilitate operation, a portion Ib of the nut inwardly of the knurling preferably carrying a graduated scale 26 which may be read against a datum line 2'I on the adaptor body. Extending side by side with the wedge member I6 in the longitudinal recess I4 of the mandrel is a wire 28 one end of which passes into the bore II of the adaptor body while the other end 28a, is bent upwardly at the tip and rests on a lip Ilia of the stone holder. The end of the wire which passes into the bore of the adaptor body is spring loaded so that the wire normally applies end pressure to the stone holder I and retains the stone in position in the mandrel.

As shown in Figure 3, the aforesaid spring loading is arranged by carrying the wire rearwardly almost to the end of the adaptor body and then bending it back upon itself, as indicated at 2819. The portion 28h extends forwardly in an offset bore 3I in the body I of the adaptor and carries at its forward end an abutment member 29. A compression coil spring 32 is arranged round the portion 28D and abuts the member 29 at one end and a closure cap 39 for the bore 3l at the other. Thus the spring 32 normally presses the tip 28a of the wire against the stone holder I5 but the wire may be withdrawn against the spring pressure in order to permit removal and replacement of the stone in its holder. Alternatively, spring loading of the wire 28 may be effected, as shown in Figure 1, by bending a wire into the U formation 28e and pressing the free end of the wire into a recess 33 in the body. In this arrangement the wire itself constitutes the spring, the broken lines showing the position to which it is deflected when changing of the stone holder has to be effected. To facilitate manipulation of the spring portion 28e of the wire in this construction the body l0 is preferably counterbored at 34 to afford additional space.

The mandrel I2 may be one of a series of standard mandrels which may readily be removed from the body I0 of the adaptor and replaced by another, and may be of the usual construction with the exception of the serrated portion Ia of the wedge member.

It will be seen that the adaptor is of generally cylindrical form and, with a mandrel I2 mounted therein, constitutes a self-contained unit which may be readily mounted in the chuck of a lathe for rotation relatively to the work while providing for adjustment of the effective diameter of cut of the abrasive element. When using the honing device in this manner the portion Illa, Figure 2, is mounted in the chuck. If desired, however, the work may be rotated and the adaptor held in the hand to offer the mandrel into the hole to be honed.

I claim:

1. An adaptor for a honing mandrel of the type having an abrasive element. a holder .for said abrasive element radially slidable in a longitudinal slot formed in the body of said mandrel. an elongated blade-like wedge member axially slidable in said slot for the radial adjustment of said holder and abrasive element. and a spring loaded member which extends axially along said slot and one end of which is in contact with and applies end pressure to said holder to retain it in position in the mandrel body, said adaptor comprising in combination a body centrally bored to receive and form a substantially cylindrical bearing for said mandrel which proor knurled at jects thereinto and the operative end of which extends outwardly therefrom, said adaptor body having an anchorage for the free end of said spring loaded member formed towards the end of the adaptor body remote from the mandrel, a nut rotatably and coaxially arranged on said adaptor body, means whereby said nut is prevented from axial movement relatively to said adaptor body, and a member coacting with the blade-like Wedge member and which engages with the screw threads of the nut to effect axial movement of the blade-like wedge member and resulting radial movement of the abrasive element in the mandrel body.

2. An adaptor according to claim 1, wherein said means whereby the nut is prevented from axial movement comprise an element which projects from said adaptor body into an annular recess in the nut and the member coacting with the blade-like wedge member comprises a projecting serrated portion of said wedge member which engages with the screw thread of the nut, the wedge member being thereby traversed longitudinally back and forth in the mandrel body under rotation of the nut to effect radial adjustment of the abrasive element.

3. A honing device comprising in combination a mandrel body having a longitudinal slot formed therein, an abrasive element, a holder for said abrasive element radially slidable in said slot and upon the outer face of which said abrasive element is mounted, an elongated blade-like wedge member axially slidable in said slot and wedge portions of which engage with wedge portions of said holder to effect radial adjustment of the latter and the abrasive element, a spring loaded member which extends axialh7 along said slot and one end of which is in contact with and applies end pressure to said holder to retain it in position in the mandrel body, an adaptor having a body centrally bored to receive and form a substantially cylindrical bearing for the mandrel body which projects thereinto and the operative end of which extends outwardly therefrom, a nut rotatably and coaxially arranged on said adaptor body and an element which projects from said adaptor body into an annular recess in the nut to prevent axial movement thereof with respect to said adaptor body, said spring loaded member passing through the bore in the adaptor body and having its free end secured to an anchorage formed in said adaptor body towards the end of the latter remote from the mandrel body and the blade-like wedge member having a serrated portion which engages with the screw thread of the nut whereby the wedge member is traversed longitudinally back and forth in the mandrel body under rotation of the nut to eiect radial movement of the abrasive element in the mandrel body.

GEORGE FREDERICK WAGSTAFF.

REFERENCES CITE The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,435,164 Kline Nov. 14, 1922 1,883,285 Zimmerman Oct. 18, 1932 1,918,077 Agostini July 11, 1933 2,283,132 Wommer May 12, 1942 2,286,350 Gjertsen June 16, 1942 2,376,851 Sunnen May 22, 1945 

